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Wahidah Wahidah
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Journal : Geosains Kutai Basin

 1 
Studi Identifikasi Sebaran Ion Logam Pb, Cu, As dan Cd pada Air dan Sedimen di Perairan Bontang Kalimantan Timur Menggunakan Metode Kriging (Ordinary Kriging) ani, ani ani; Wahidah, Wahidah; Mandang, Idris
GEOSAINS KUTAI BASIN Vol 6 No 1 (2023)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v6i1.1001

Abstract

Bontang is one of the cities in East Kalimantan which is geographically located in coastal areas so that it is very vulnerable to marine pollution both from domestic human and industrial activities. This study aims to determine the level and pattern of distribution of poluton metal ions Pb, Cu, As and Cd in water and sediments in Bontang waters using the Kriging (Ordinary Kriging) method. In this study, 4 observation samples were used which were tested in the laboratory to determine the content of heavy metals. Furthermore, the data from laboratory tests along with 4 secondary data were interpolated using the ordinary kriging method with an exponential model to determine the pattern of contour distribution in Bontang waters. The results showed that the heavy metal with the highest distribution value in water and sediment is cadmium with a susceptibility value ranging from 0.006 mg/l to 9.070 mg/l. In general, the pattern of spread of heavy metals originates from coastal areas in a southeasterly direction. The most influential thing on this pattern of spread is tidal currents and bathymetry.
Perbandingan Nilai Resistivitas Menggunakan Metode Logging Resistivitas Listrik dan Electrical Resistivity Tomography (ERT) Antony, Nurvani; Lepong, Piter; Wahidah, Wahidah; Supriyanto, Supriyanto; Djayus, Djayus
GEOSAINS KUTAI BASIN Vol. 6 No. 2 (2023)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v6i2.1094

Abstract

Metode geolistrik sering digunakan untuk menginterpretasikan lapisan bawah permukaan yang dangkal. Namun dalam kenyataannya, metode ini memberikan pengukuran resistivitas bawah permukaan yang berbeda dengan metode log resistivitas. Selain itu, metode ini memiliki kelemahan dalam membaca lapisan tipis saat kedalaman pengukuran bertambah. Oleh karena itu, dilakukan penelitian ini untuk membandingkan metode geolistrik dan log resistivitas, serta menentukan faktor-faktor yang menyebabkan perbedaan pengukuran tersebut. Penelitian ini menggunakan data sekunder yang nantinya diolah menggunakan software tertentu. Data geolistrik diolah menggunakan Res2DINV untuk memperoleh penampang resistivitas 2D. Kemudian data log resistivitas diolah menggunakan WellCAD untuk memperoleh kurva resistivitas. Kedua hasil tersebut digabungkan dalam satu gambar untuk dibandingkan dan dianalisis perbedaannya. Hasil yang diperoleh menunjukan bahwa nilai resistivitas semu yang ditampilkan penampang geolistrik lebih kecil dibandingkan kurva resistivitas milik log resistivitas. Selain itu, terdapat sedikit perbedaan interpretasi antara keduanya, dimana metode geolistrik tidak dapat membaca lapisan tipis yang cukup dalam, seperti batubara, dan metode log resistivitas tidak dapat membaca lapisan clay.
Estimasi Sumberdaya Nikel Menggunakan Metode Inverse Distance Weighted (IDW) Berdasarkan Data Eksplorasi Daerah X Kecamatan Nuha Kabupaten Luwu Timur Sulawesi Selatan Prasetyo, Gaguk Lulus; Lepong, Piter; Wahidah, Wahidah
GEOSAINS KUTAI BASIN Vol. 6 No. 2 (2023)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v6i2.1129

Abstract

Estimasi sumberdaya berperan penting dalam penentuan kualitas dan kuantitas dari suatu endapan di suatu daerah eksplorasi. Metode estimasi yang dipilih disesuaikan dengan kondisi geologi dan mineralisasi. Penelitian ini bertujuan untuk menentukan estimasi sumberdaya nikel dengan menggunakan metode Inverse distance Weighted di daerah X Kecamatan Nuha Kabupaten Luwu Timur Sulawesi Selatan. Jumlah titik bor yang digunakan dalam perhitungan sumberdaya adalah 125 titik bor. Dari data tersebut akan dibuat model blok awal dari batas limonit dan saprolit, kemudian digunakan interpolasi IDW pada model blok tersebut untuk menghasilkan estimasi sumberdaya. Hasil estimasi sumberdaya nikel menggunakan IDW menunjukan tonase sumberdaya Ni sebesar 1.899.938 ton dengan rata-rata kadar Ni 2,07%. Berdasarkan hasil yang sudah didapatkan terdapat faktor yang mempengaruhi dalam perhitungan yaitu metode IDW menghitung suatu nilai berdasarkan titik data yang terdekat dengan blok dan hanya memperhatikan jarak sehingga data dengan jarak yang sama namun memiliki sebaran data yang berbeda akan menghasilkan hasil yang sama. Dari hasil klasifikasi sumberdaya sebagian besar sebaran titik bor tergolong dalam klasifikasi sumberdaya terukur.
Analisis Potensi Swabakar (Self-Combustion) Berdasarkan Data Proksimat pada Batubara PT. Geoservices Samarinda Wahidah, Wahidah; Fajarwati, Delia Aurora; Lepong, Piter; Alamsyah, Andi
GEOSAINS KUTAI BASIN Vol 5 No 2 (2022)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v5i2.1062

Abstract

The self-combustion phenomenon that has the potential to cause fires in the coal mining industry in East Kalimantan is the subject of this study. The purpose of this study is to determine the quality and characteristics of coal that has the potential to trigger self-heating. In this research, 5 (five) samples of coal quality are analyzed from PT. Geoservice Samarinda using the proximate analysis method and analysis of calorific value and total sulfur. Next, determine ranking of coal and analyze the characteristics of coal samples that are prone to potential self-combustion. The results show that the five coal samples included in Sub-Bituminous rank with medium volatile matter considered to have sufficient potential to experience self-combustion. The most susceptible coal sample is sample code D1 because it also has lower inherent moisture and ash content and higher total sulfur content than other coal samples. However, further tests still need to be carried out to determine the percentage of total sulfur (pyrite) as a trigger for self-combustion. Environmental factor analysis is also required for validation.
Analisis Proksimat dan Ultimat Terhadap Total Sulfur dan Nilai Kalori pada Batubara (PT Geoservices Samarinda) Fajarwati, Delia Aurora; Lepong, Piter; Wahidah, Wahidah
GEOSAINS KUTAI BASIN Vol. 6 No. 2 (2023)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v6i2.1145

Abstract

The price of coal in the market is largely determined by the caloric value. To find out what parameters affect the calorific value, it is necessary to do a correlation between the calorific value, inherent moisture, ash content and volatile matter contained in the coal where these contents are found in the proximate analysis and the carbon, nitrogen and hydrogen content in the ultimate analysis. In this study, apart from correlating the proximate data and ultimate data with calorific value, these two data were also correlated with total sulfur because sulfur greatly impacts the environment, so it is necessary to ensure that the amount is below the set threshold. The correlation used is Pearson Correlation. Determination of coal classification using standards Americans Society For Testing & Materials (ASTM). Correlation test results showed that total sulfur had a very strong correlation with inherent water content, volatile matter content, fixed carbon and hydrogen content. The calorific value correlates very strongly with the inherent water content, fixed carbon and nitrogen content. However, total sulfur and calorific value did not correlate with ash content. The coal classification of the five samples is included in the sub-bituminous class with a calorific value range of 10,500 Btu/lb - 8,300 Btu/lb.
Penentuan Litologi Batuan di Daerah Samboja Berdasarkan Analisis Pemodelan 3D Data Cutting dan Data Logging Geofisika Situmeang, Edberg; Djayus, Djayus; Wahidah, Wahidah; Supriyanto, Supriyanto; Lepong, Piter
GEOSAINS KUTAI BASIN Vol. 6 No. 2 (2023)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v6i2.1087

Abstract

The interpretation of rock lithology is inaccurate if it only uses cutting data, so it must be assisted with other data, including logging data. The purpose of this study was to determine the lithological arrangement of rocks based on cutting data and logging data and to compare the cross section results of cutting data and logging data. This study uses cutting data and logging data (gamma ray log and density log). Cutting data and logging data will be interpreted and processed into 2D and 3D sections which are corrected with topographical data including coordinates, elevation values, strike dip and total depth. The results of processing from both methods, obtained lithology composition in the form of soil, silt, sand, coal, clay, carbon and carbont clay.
Co-Authors A.A. Ketut Agung Cahyawan W Ahmad Ahmad Ahmad Zarkasi Ahmadi Hasan Akrim, Akrim Al Amruzi, HM Fahmi Alamsyah, Andi Alamsyah, M Noor Alias Azhar Alias Azhar, Alias Amelia Rahmaniah Amrullah Amrullah Ananda, Rizqa Angga Putra, Angga Anggraini, Dea ani, ani ani Antony, Nurvani APHA, Journal Manager Asniwaty, Asniwaty Aulia Rahman Ayatullah Ayatullah, Ayatullah azisyarlina, Dwi Baiduri, Mohammad Adnan Balqis, Siti Basri Basri Dadan Hamdani, Dadan Damayanti, Putri Surya Djayus, Djayus Dominikus Rato Dzikri, Dykall Naf'an Emy Handayani Fajarwati, Delia Aurora Fajrianor, Muhammad Firdaus, Muhamad Akmal Fitria Fitria Flora Ramona Sigit Prakoeswa Friska, Friska Fuadi, Muhammad Nur Getteng, Abd. Rahman Gusti Muzainah Hadi Lubis , Irda Auliya Hafsa, Sri Sholeha Haidawati, Purna Harahap, Reni Agustina Hery Widijanto Hidayah, Hidayah Idris Mandang, Idris Ilhami, Adi Wahyu Ilhami Indah, Fauziah Insan, Asyraful Iqbal Farabi Sufi, M Isra, Nur Kalbi Jafar Khairunnisa Khairunnisa Kiftiyah, Khoyumatul Leny Leny, Leny Lepong, Piter Lestari, Ayu Wahyuni Limoa, Erlyn Lulu Indriaty, Lulu Indriaty M. Fahmi Al Amruzi, M. Fahmi M. Hanafiah Maghfiratullah, Maghfiratullah Mahdian Mahdian, Mahdian Mahyiddin, Mahyiddin Maolana, Bagas Mariani Mariani Marthin, Marthin Maryanto ,, Maryanto Maulana, M. Fajar Mauloeddin Afna, Mauloeddin Mislan Mochammad Erwin Rachman, Mochammad Erwin Muh. Ilyas Ismail, Muh. Ilyas Muhammad Kusasi muhammad rizky, muhammad Muhammad Saleh Muhammad Yusman Muhsin Aseri, Muhsin Muhtar Muhtar Mulya, Fety RQ. Munawarah Munawarah, Munawarah Munir, Rahmawati Muslimah Muslimah Mustaqimah, Umi Muyassar, Muhammad Hafidz Nazhifah, Ainun Noorsa'adatina, Noorsa'adatina Nur Aida, Nur Nurhazana, Nurhazana Nurul Jannah Nurwijayanti Nuryupa, Nuryupa Pawana, Sekhar Chandra Prasetyo, Gaguk Lulus Purwoko, Agus Puspita, Ade Ayu Putri, Kesya Azzahra Rabi’ah, Rabi’ah Rahma Eka Putri Rahmad Mulyadi Rahmawati, Ricky Rahmiati Rahmiati Rasul, Muhammad Rini Fidiyani Ririn Safitri Rosnidar Sembiring Rusydi Rusydi Ryamizar, M. Sahara, Hertina Sami'in, Sami'in Samsuri, Suriadi Saputra, Wira Aditia Sirait, Adi Syahputra Situmeang, Edberg Soetomo, Risqi Hartiasih Solly Aryza Sri Warjiyati Sugiyanto - Sumiati Sumiati Suprapto Suprapto supriadin supriadin Supriyanto Supriyanto Syahid, Akhmad Mawardi Syahputra, Ridwandha Eka Syauki, Muhammad Tandiriterung, Selfi Ravianty Wahdah, Wahdah Wiandari, Fadhillah Winda Winda Zahratul Idami Zainuddin, Zainuddin Zaitun, Siti Zeti Nofita Sari Ziyad, Ziyad Zulfianah, Zulfianah